This article shows and explains the situation when the ARP reply packets leaving the APM can be transparently changed under certain circumstances.Symptoms:
1. "mac-usage vrrp-mac
" is configured on circuit's virtual router
2. APM packet capture (tcpdump) shows that the ARP replies leaving the VRRP enabled circuit are carrying circuit MAC address instead of the (expected) VRRP MAC address. This is then transparently changed and NPM is already showing the expected VRRP MAC address.
ARP reply payload|
10.1.1.1 is at 00:03:d2:f1:01:01|
10.1.1.1 is at 00:00:5e:00:00:01|